image - Reading a JPEG in Python (PIL) with broken header -


i'm trying open jpeg file in python 2.7,

from pil import image im = image.open(filename)

which didn't work me,

>>> im = image.open(filename) traceback (most recent call last):   file "<pyshell#810>", line 1, in <module>     im = image.open(filename)   file "/usr/lib/python2.7/dist-packages/pil/image.py", line 1980, in open     raise ioerror("cannot identify image file") ioerror: cannot identify image file

though when trying out on external viewers, opened fine. digging in bit, turns out jpegimagefile._open method pil's jpegimageplugin.py file raises syntaxerror exception due several extraneous 0x00 bytes before 0xffda marker in jpeg's file header,

corrupt jpeg data: 5 extraneous bytes before marker 0xda

that is, while other programs tried ignored unknown 0x00 marker towards end of header, pil prefered raise exception, not allowing me open image.

question: apart editing pil's code directly, there workaround opening jpegs problematic headers?

the relevant code jpegimagefile class raises exception appears below, convenience:

def _open(self):      s = self.fp.read(1)      if ord(s[0]) != 255:         raise syntaxerror("not jpeg file")      # create attributes     self.bits = self.layers = 0      # jpeg specifics (internal)     self.layer = []     self.huffman_dc = {}     self.huffman_ac = {}     self.quantization = {}     self.app = {} # compatibility     self.applist = []     self.icclist = []      while 1:          s = s + self.fp.read(1)          = i16(s)          if marker.has_key(i):             name, description, handler = marker[i]             # print hex(i), name, description             if handler not none:                 handler(self, i)             if == 0xffda: # start of scan                 rawmode = self.mode                 if self.mode == "cmyk":                     rawmode = "cmyk;i" # assume adobe conventions                 self.tile = [("jpeg", (0,0) + self.size, 0, (rawmode, ""))]                 # self.__offset = self.fp.tell()                 break             s = self.fp.read(1)         elif == 0 or == 65535:             # padded marker or junk; move on             s = "\xff"         else:             raise syntaxerror("no marker found")

pil doesn't corrupt data in header , falls on you've discovered.

i've made pull request pillow (the friendly pil fork) should fix problem.

it's not yet been accepted, it'll there version 2.5.0 due out in couple of months. in meantime, can try out here: https://github.com/python-imaging/pillow/pull/647

as workaround, use imagemagick first convert problematic images png, , use them in pil/pillow.


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